Ukraine
What the source says
Referenced, awaiting primary-source reviewOfficially adopted on 28 January 1992, following its de facto restoration on 24 August 1991. The roots of Ukrainian national symbols come from pre-Christian times when yellow and blue prevailed in traditional ceremonies, reflecting fire and water. [No specific meaning is explicitly stated for either colour of the modern flag.]
Referenced, not verified: a secondary work states this, and the document that constitutes the flag has not been read for this entry. What the marks mean.
Colors
Symbolism and history(r1)
A plain blue-over-yellow bicolor, restored de facto on 24 August 1991 and officially adopted on 28 January 1992; the roots of the yellow and blue reach back to pre-Christian ceremonies in which the two colours reflected fire and water.
Most similar flags
The 6 closest of the 194 other national flags, ranked by a similarity index computed from the flag images themselves. The number is that index, 0–100 — not a claim that the two flags are “X% identical”.
- Rwanda80
the same horizontal band layout; the same colours in similar amounts.
- Gabon71
the same horizontal band layout; the same colours in similar amounts.
- Democratic Republic of the Congo70
the same horizontal band layout; the same colours in similar amounts.
- Brunei Darussalam65
the same horizontal band layout; similar colours in a different arrangement.
- Greece64
the same horizontal band layout; similar colours in a different arrangement.
- Nicaragua64
the same horizontal band layout; similar colours in a different arrangement.
Computed at build time: each flag is rasterised to 64x48, and the score is 0.55 × colour overlap + 0.45 × structure. A different weighting would rank these differently. How the index works.
References — not verification
(r1) Referenced to Flag of Ukraine (Wikipedia (English)) on 2026-07-17. States the adoption year, which colors the flag has and the symbolism and history on this page. The passage it states them in is quoted at the top of this entry.
Further reading: Flag of Ukraine on Wikipedia